Device for testing piston-rings.



D. J. CAMPBELL.

DEVICE FOR TESTING PISTON RINGS.

APPLICATION FILED OGT.10, 1911. 1 ,O36,4- 48 Batented Aug. 20, 1912.

gvwemboz bonmd Jcammba DONALD J. CAMPBELL, 0F MUSKEGON, MIbHIGAN.

DEVICE FOR TESTING PISTQN-RINGS.

Specification of Letters Patent.

- Patented Aug. 20, 1912.

Application filed October 10, 1911. Serial No. 653,856

A 0 (no w/wm it'mag/ concern:

Be it known that 1, Donna) J. (hMUlPJGlJi, a citizen of the United States of America, residingat lvtuskegon, in the county of M uskegon and State of li/Iichigan, have invented certain new and useful improvements in Devices for Testing Piston-Rings; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in devices for testing piston rings and its object is to provide a device adapted to readily determine the resilience and resistance of piston rings and other like structures and to provide the device with various new and uset'ul features as hereinafter more fully described and particularly pointed out in the claims.

M device consists essentially of a fixed member and a movable member adapted to be secured to the res 'iective ends of the ring adjacent the division therein, a beam or arm attached to the movable member and carrying an index, a scale to indicate the amountof movement of the 'arm and a weight applied to the arlmand adjustable thereon said movable membe preferablyhaving oppositely projecting weighted arms" whereby both the expansion and contraction ot'lhe ring; may be tested and in various detail of construction and arrangement as will more fully appear by rcterence to the accompanying drawings, in which:-

Figure 1 is a side elevation of a device embodying my invention; Fig. 2 an enlarged detail of the pivot of the jaws taken on the line 2-1. of Fig. 1; Fig. 3 the same at one of the clamps for attaching the ends of the ring to the respective jaws; Fig. 4 a detail. of the means for holding" the weighted lever 7 in neutral position on the scale; and Fig.

5 a detail of the stop for the beam.

Like numbers refer to like parts in all or". the figures.

1 represents a piston ring in position to be tested.v

2 a fixed sen'iieircular jaw and 3 a similar semicircular jaw oppositely arranged and movable relative to the jaw 2. These jaws at one side are pivoted to each other on pivot screws 6 whereby the jaw 3 turns freely about the axis of the pivot, its movable end adapted to more toward and away t'rom the opposingend of the jaw 2. The ends of these jaws opposite the pivot are each provided with a clamp to engage the respective. ends of the ring and hold the same in fixed relationto the respective ends of the jaws. iilllfi'clitl'lll) consists preferably of a binding screw t and an adjustable screw 4 engaging the opposite sides of the ring whereby rings of diti'erent widths can be curely attached to the respeetivejaws without. straining the spring from its normal shape. These screws are rounded at the ends to permit the rinp to turn therebetween and thus avoid frictional resistance to movement.

T is an arm or beam projecting from the movable end otthe ja-w 3 and rigidly secured thereto. 8 is a substantially similar beam projecting oppositeiy from the pivoted endoit' the jaw i 9 and 10 are wei hts respectivel adjustable on the respee'iie beams whereby the weight 9 tends to close the ring and reduce its-diameter and the weight 10 tends t'oo ien the ring and increase its diameter, the. leverage ot the respective beams being diti 'l'erent. the arm 8 beingashorter lever than thearm "Z. The weights 9 and 10 have corrcspomling diti'erent I weights whereby when each is adjusted to similar portions or" the scale on the respective beams the num her of pounds of strain on the ring will be equal in each case.

It is a scale opposite thepointed end of the arm 7 whereby the amount of expansion or contraction of the ring is indicated on the scale. An opening is made in the scale 11 opposite the zero positionthe beam 7-and a pin 12 is removably inserted in the beam to hold the same at this position while in- Setting the ring, in place. W hen both weights at". at the zero mark on the respective arms the. device is so proportioned that the beams will balance with the index or pointed end of the beam 7 at zero on the scale 11. Any slight. variation from this position can be readily corrected by adjusting the scale ll by means of the slotted opening therein and the thumb screw 13. To limit the movement of the beam 7 it prefer also to use a clamp 14 adjustable on the scale 11 and held by a thumb screw 15.

in operation, the device is adjusted to zero en the scale and the ends of the ring 1 sei set nnpnrted' to the member and NH, ,l- H i curely attached to the res ective jaws of the device. The screws at audiet? having IOIlIId ed ends will securely hold the ring from moving relati ye to the ends of the jaws and tit the saline time permit the movable. jaw 3 to rise and fall without appreciable res1stance to the same. By moving the weight 9 out on the-beam-7 the jaws 'willbe closed more orless, the position of the weight on the beam indicating the' strain upon the ring and :the positiomof the pointed end of the-heam'indicatingjon' the scale the almount that the beam has moved from the horizontal and closed the fringe When the weight 9 is'moved to zero-position again if there has lweerrnWbenditng or permanent ring the beam 7 will swing back to'the'zezo position on the scale. Obviously movement of theweight 1.0 on the arm 8 will; expand the ring, the amount of expansion being indieated' on the scale 11 by upwardmovement'of the" beam 7' which will again return to the zero position if there hashe en no bending or xu'nianent im parted itosthe-ring. "Ihe"ring' may thiis readilyy'te'st'ed for the amountof strain re it as the'e as'e may be or the amount of expansion or'compression that it--will withsitatld without; taking on a permanent ehangeof form; i

1: A1)iS$-=1II'ln tester, comprising 'a' fixed a moigable member, fmeans for attaching said m'emhe1'stb the" res'petive ends-(if a divided ring; 'o ipositely'fnovabl beams connected to said movable member to :"move the same" in opposite ,direotaons', a

amount of said stre weight adjustable; "on one beam to applj" expanding stress to "the"ring, a weight on the 'othe'r beam to apply contraetin stress to the ring, and means for indioa'ting the Sses'."f 7

2.- A i pisteii ring tester comprising a fixed meniher, and a' movable hiemb p'iiroted thereto, mean's forattaching? a 'd is- -movable member, 'beamsj fikedon tlie. mov

able memberfand projectingf oppositely from i the pivot of the same; a weight justahle' om'eaxih said member 1 rounded Tends to A piston ringtester,eomprising in presence v am to oppositely move: I

and means for measuring said l i i movements;-

- 3. A plston ring tester, comprising a fixed -jaw and a movable jaw pivoted to each other A andvudapted tosurround the ring, means for 65 attarhing the ends of the ring to the respee tive jaws, a scale beam projecting from the movable jaw, a weight adjustable on said beam, an oppositely projecting beam on the movable jaw and a weight adjustable on the last immed beam.

4. A [)lSlOllring tester comprising a fixed .niemlm1"aI,1d a nomble member, opposing clamping SCI'OWS .111 each member having sjieetiiie sides ofv the ring near its ends,v a beam connected to the movab e member and :1 weight ad ust-able on the llCillil-z A p st on ring tester, epmprismga pair pivotally engage the re- ,of senii-cirei'ilal' jaws pivoted, to ttlf'll nth-r at" 'one'js'ide, one jaw being lite-d and the other movable,plamplng screws All the aws ustahle oneaqh beam and a seule opposite theouterendof one of thelheams. j 6; piston ring tester, compr dug a pair of sernheiroular jaws pii otodit k-h other at one side, one jaw heingnnova lo and the other jaw fixed, damping For posite side of jaws to engage a iston.- riii'g, ars /ale beam projegtiugfrom the mow-- able jaw, a scale near the outer end of. lid beam and weight adj stable-on; said beaim member and a movable member, meansfee attachingthe same to ll'iBIBSpQCtlVB ends of 'a piston ring, a scale beam projecting.from

the movhble member, a scale near the outer j DONALDJ. QMVH BELL.

' Witnesses:

ADAM Prime Y i I. WYAN'I. I i

in the opan alixed :en of the beam, astop adjustuble-on the iereofl aflix my signature 9? 

